CN1061793A - Gear oil composition - Google Patents
Gear oil composition Download PDFInfo
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- CN1061793A CN1061793A CN91109204A CN91109204A CN1061793A CN 1061793 A CN1061793 A CN 1061793A CN 91109204 A CN91109204 A CN 91109204A CN 91109204 A CN91109204 A CN 91109204A CN 1061793 A CN1061793 A CN 1061793A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M143/00—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation
- C10M143/12—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation containing conjugated diene
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M7/00—Solid or semi-solid compositions essentially based on lubricating components other than mineral lubricating oils or fatty oils and their use as lubricants; Use as lubricants of single solid or semi-solid substances
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M143/00—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation
- C10M143/10—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation containing aromatic monomer, e.g. styrene
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/04—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing aromatic monomers, e.g. styrene
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/06—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing conjugated dienes
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides gear oil composition, said composition comprises base oil and hydrogenant star polymer, and this star polymer has four arms at least, every arm comprises (before hydrogenation) polymeric conjugated diene monomeric unit, its weight-average molecular weight is in 3,000 to 15,000 scope; The method for preparing said composition also is provided and in gear oil composition, uses this hydrogenation star polymer as the viscosity index improver additive.
Description
The present invention relates to comprise the hydrogenation star polymer gear oil composition, said composition the preparation method and use this polymkeric substance as the gear oil viscosity index improver.
The existing many polymerization viscosity of lubricating oil refer to cross improving agent, but great majority do not have receptible high shear stability in the gear oil.Commodity gear oil viscosity index improver comprises polybutene and polymethylmethacrylate.As can received gear oil viscosity index improver, this polymkeric substance of two types must preshearing be cut to uniform lower molecular weight.This pre-shearing has increased the cost of production process, moreover the pre-polymkeric substance of shearing is invalid as thickening material, desires to make the gear base oil to have acceptable viscosity index to improve, and the two all needs sizable amount.
Another kind of gear oil viscosity index improver in the prior art is disclosed in U.S.P.4,082,680.This patents state the quite low hydrogenated butadiene/styrenic diblock copolymer of molecular weight.The weight percent of its divinyl is 30-44%, and molecular weight is 12,000-20,000.This is a kind of lower molecular weight type of Synthetic rubber, isoprene-styrene, hydrogenated, block, diblock, is the known viscosity index improver that is used for machine oil, and as pre-shearing viscosity index improver, its lower molecular weight produces low relatively thickening efficiency.Therefore, give the multiviscosisty gear oil and just need higher concentration with acceptable viscosity index.
Star (or radiation configuration) hydrogenated conjugated diene polymer is the known viscosity index improver that is used for machine oil, but such engine oil viscosity index improving agent is because its low shear stability, as the gear oil viscosity index improver equally also is unacceptable, this class engine oil viscosity index improving agent is disclosed in U.S.P.4,156,673.The * original text multigrade of star polymer
General its molecular weight of oil soluble is more much higher than line style person's molecular weight.Because high-molecular weight polymer is more effective thickening material, only need less polymkeric substance.Produce significant economic interests in the time of will making hydrogenation star conjugated diolefin polymer as oil lubricating oil viscosity index improving agent like this.Effectively the high-molecular weight star polymer more has shear stability also in this patent disclosure than simple linear polymer, but unexposed shear stability when being used for gear oil.
Show that the desirable viscosity index improves performance and has the additive of high shear stability to be used as gear oil viscosity.The index improving agent has further needs, preferably uses the amount littler than prior art.
The invention provides a kind of gear oil composition, said composition comprises base oil and hydrogenant star polymer, and star polymer comprises at least four support arms, each support arm comprises the polymerized conjugated diene monomeric unit before the hydrogenation, its weight-average molecular weight is 3,000-15,000.
When the preparation gear oil, can adopt the base oil of various mineral oil easily as composition, though also available when needed other base oil, the synthetic fraction of poly-alpha olefins, polyoxyethylene and so on for example, mineral oil is that raw material is made by oil generally, is the complex mixture that many hydrocarbons close, mineral oil is the refined product of oil preferably, as derive from well-known refining product processed, for example hydrogenation, polymerization, solvent extraction, the converted products of dewaxing etc.Usually, 40 ℃ of kinematic viscosity measuring by the method for ASTM D445 are 100-400mm
2/ s(cSt), the kinematic viscosity in the time of 100 ℃ is 10-40mm
2/ s(cSt).This oil can be two or more mixture of paraffinic hydrocarbon, naphthenic hydrocarbon or arene and they.Many suitable lubricating compositions and component all have commercially available.
The concentration of hydrogenant star polymer can be different in this gear oil, and it changes the limit broad.For example: from 0.1(preferably 0.15) to 20%(weight); Particularly select 0.5 from 0.15(is preferential) to 10%; Best is from 0.5 to 2%(weight), calculate based on the weight of composition.
Hydrogenation star polymer of the present invention can be with comprising that following reactions steps prepares it:
(a) in the presence of ionic initiator in solution with one or more conjugated diolefines and optionally one or more mono alkenyl arene compounds and/or other monomer polymerizations in a small amount, form living polymer;
(b) with living polymer and the reaction of polyalkenyl coupling agent, form star polymer;
(c), form the hydrogenation star polymer with star polymer hydrogenation.
The living polymer that generates in the reactions steps (a) is the precursor of hydropolymer chain, and it is from poly-polyalkenyl coupling agent) nuclear stretches out.
The preparation of living polymer be with conjugated diolefine and optionally the aromatic hydroxy compound of mono-alkenyl in the presence of as the basic metal of ionic initiator or basic metal hydrocarbon (as sodium naphthalene), carry out with the solion polymerization.The preferential initiator of selecting is lithium or single lithium hydrocarbon.The lithium hydrocarbon that is fit to comprises undersaturated compound, as allyl group lithium, 2-methylallyl lithium, aromatic substance (as phenyl lithium, tolyl lithium, xylyl lithium and naphthyl lithium; Lithium alkylide (as lithium methide lithium ethide, propyl lithium, butyllithium, amyl group lithium, hexyl lithium, 2-ethylhexyl lithium and n-hexadecyl lithium) particularly.S-butyl lithium is the preferential initiator of selecting.In polyblend, initiator can add with two steps and multistep, also can add together with additional monomer.Living polymer is that olefinic is undersaturated, also can be that aromatics is undersaturated.
The resulting linear unsaturated living polymer of step (a) is by one or more conjugated diolefines, for example C
4-C
12Conjugated diolefine and one or more mono alkenyl arene compound optionally.
The example of the conjugated diolefine that is fit to comprises divinyl (1,3-butadiene); Isoprene; 1,3-pentadiene (piperylene); 2,3-dimethyl-1,3-butadiene; 3-butyl-1, the 3-octadiene; 1-phenyl-1,3-butadiene; 1,3-hexadiene and 4-ethyl-1,3-hexadiene.The preferential conjugated diolefine of selecting is divinyl and isoprene; Except a kind of and multiple conjugated diolefine, living polymer also can be partly derived from one or more mono alkenyl arene compounds.
As with 1,3-butadiene as principal monomer, preferably polyreaction being controlled at and making at least 55% divinyl is 1, the 2-addition polymerization.Low-level 1,2-addition polyhutadiene can make the low-temperature performance of resulting gear oil very poor.1 of divinyl, the currently known methods of the available prior art of 2-addition amount is controlled, as using polar solvent or polar modifier.Can obtain 55% or above divinyl 1 with tetrahydrofuran (THF) as solubility promoter, the 2-addition.
The preferential mono alkenyl arene compound of selecting have monovinyl aromatic compounds such as vinylbenzene, mono-vinyl naphthalene and their alkyl derivative as adjacent-,-, p-methylstyrene alpha-methyl styrene and t-butyl styrene, vinylbenzene is because its supply is wide, reasonable price is so be the preferential mono alkenyl arene compound of selecting.As with mono alkenyl arene compound living polymer, its usage quantity is 50%(weight preferably) and lower, preferentially select 3%-5%.
Living polymer also can be partly derived from other monomers in a small amount, as mono-vinyl pyridine, vinylformic acid and alkyl methacrylate (methyl methacrylate for example, lauryl methacrylate, methacrylic acid stearyl), vinylchlorid, vinylidene chloride and carboxylic acid list vinyl acetate (for example vinyl acetate and stearic acid vinyl ester).
Living polymer can be active homopolymer, active copolymer, active terpolymer, active tetrapolymer etc.Active homopolymer can be represented by formula A-M, and wherein M is cationic moiety (a for example lithium), and A is homopolymer (for example polybutene or a polyisoprene).The reactive polymer of isoprene is the preferential active homopolymer of selecting.Active copolymer can formula A-B-M representative, wherein M is cationic moiety (a for example lithium), A-B is a block, random or form the inversion multipolymer as poly-(Butadiene), poly-(Butadiene) or poly-(isoprene/vinylbenzene).It more than is not the restriction that monomer in the living polymer is arranged.For example, active poly-(isoprene/vinylbenzene) multipolymer can be active polyisoprene/polystyrene block copolymer, active polystyrene/polyisoprene blocks multipolymer.Active poly-(isoprene/vinylbenzene) random copolymers, active poly-(isoprene/vinylbenzene) are formed inversion multipolymer or active poly-(isoprene/styrene/isoprene) segmented copolymer.Active poly-(Butadiene/isoprene) terpolymer is an example of acceptable activity terpolymer.
Active copolymer can be reactive block copolymers, active random copolymer or the active inversion multipolymer of forming.Reactive block copolymers can be with monomeric incompatible step by step preparation, for example the polymerization isoprene forms active polyisoprene, then add other monomers again, for example vinylbenzene forms the reactive block copolymers with polyisoprene/polystyrene-M formula, or earlier styrene polymerization is formed active polystyrene, then add isoprene again, form reactive block copolymers with polystyrene/polyisoprene-M formula.
In a best specific embodiments, its arm is the diblock arm with block in outer block of conjugated diolefine and the mono alkenyl arene, so its arm is by the polymerized conjugated diene block, and then polymerization mono alkenyl arene block forms.Arm is in the terminal coupling of mono alkenyl arene block then.
This preferential method of selecting is particularly used in the combination of common strand alkenyl arene, can obtain being processed into the polymkeric substance of chip.Can be processed into the polymkeric substance of chip, be very convenient manipulation, with mucous situation different fully.
Living polymer forms in the inert liq solvent.The solvent that is fit to comprises that hydro carbons is (as pentane, hexane, heptane, octane, α-ethyl hexane, nonane, heptane, hexanaphthene; Methylcyclohexane); Aromatic hydrocarbon (for example benzene, toluene, ethylbenzene, various dimethylbenzene, various diethylbenzene, various propylbenzene) and hydrocarbon mixture (for example lubricating oil), what preferentially select is hexanaphthene.
The temperature that polyreaction is carried out can change in the scope of broad, for example from-50 ℃ to 150 ℃, preferably from 20 ℃ to 80 ℃.Reaction is preferably carried out in inert atmosphere as carrying out in nitrogen, and carries out under the pressure of for example 50-1000kpa(0.5 to 10 crust.
The used initiator concentration of preparation living polymer also can change in the relative broad range, is decided by the molecular weight of needed living polymer.
The weight average molecular weight range of the living polymer of reactions steps (a) preparation is 3,000-15,000, preferably 5,000-12,000.The shear stability of the arm of higher molecular weight is not enough, and the arm of lower molecular weight is not as adding excessive polymkeric substance, and the star polymer that obtains can not change the gear oil viscosity.
The resulting living polymer of reactions steps (a) reacts with a polyalkenyl coupling agent in reactions steps (b) then.The polyalkenyl coupling agent that can form star polymer is, for example, United States Patent (USP) 3,9185,830, Canadian Patent 75d, 645 and English Patent 1,025,295 in known coupling agent.They normally have the compound of at least two unconjugated alkenyls.This group often is connected on the electron-withdrawing group identical or inequality (for example aromatic proton).This compound has such character: at least two alkenyls can with different living polymer independent reactions, this respect is that to be different from common polymerization of conjugated dienes monomeric, as divinyl, isoprene etc.This compound can be aliphatics, aromatic series or heterogeneous ring compound.The example of fatty compounds comprises polyvinyl and polyene propylacetylene, diacetylene, phosphoric acid ester, phosphorous acid ester and dimethacrylate (for example EDMA ethylene dimethacrylate).The example of the heterogeneous ring compound that is fit to comprises divinyl pyridine and divinyl thiophene.The preferential coupling agent of selecting is the polyalkenyl aromatics, and what override was selected is many vinyl aromatic compounds.The example of this compound comprises those compounds as benzene,toluene,xylene, anthracene, naphthalene and durene, and they have at least two alkenyls to replace, and preferably directly are attached thereto.Its example comprise many vinyl benzenes (for example divinyl, trivinyl and tetrem alkenyl benzene), divinyl, trivinyl and tetrem thiazolinyl neighbour-,-right-dimethylbenzene, divinyl naphthalene, divinyl ethylbenzene, divinyl biphenyl, diisobutylene base benzene, di isopropenylbenzene and diisopropenyl biphenyl.The preferential aromatics of selecting is with formula A-(CH=CH
2) x represents it, wherein A selects the aromatic proton that replaces arbitrarily, and x is at least 2 integer.Vinylstyrene, particularly between Vinylstyrene be the aromatics that override is selected.Can use pure or commercially pure Vinylstyrene (other monomers that contain different amounts, for example vinylbenzene and ethyl styrene), coupling agent can mix use with the adding monomer (as vinylbenzene or ring-alkylated styrenes) that increases the size of nuclear in a small amount.In the case, endorse poly-to be stated as (two alkenyls coupling agent/mono-alkenyl aromatic substance) nuclear, for example poly-(Vinylstyrene/mono-alkenyl aromatic substance) nuclear.
The polyalkenyl coupling agent should add after monomer polymerization is finished basically in the living polymer of reactions steps (a), and promptly coupling agent can only add after all monomers are transformed into living polymer basically.
The amount that adds the polyalkenyl coupling agent can change in very wide limit, but best at least 0.5 mole of every mole of living polymer is preferentially selected the 1-15 mole, and override is selected the 1.5-5 mole.This amount (can be divided into secondary or repeatedly add) make usually at least 80% or 85%(weight) living polymer be transformed into star formula polymkeric substance.
Reactions steps (b) can be carried out in the used same solvent of step (a).The solvent that is fit to as mentioned above.The temperature of reactions steps (b) also can change in the limit of broad, as 0 ℃-150 ℃, and preferably 20 ℃-120 ℃.Reaction also can be carried out under rare gas element such as nitrogen and pressure.Used pressure is preferably the 50-1000KPa(0.5-10 crust).
The feature of the prepared star polymer of reactions steps (b) is to have crosslinked poly-(polyalkenyl coupling agent) intensive center or nuclear and many arms that is actually linear unsaturated polymer to stretch out from it.The number of arm can be very inequality, but typically in the scope of 4-25, preferentially select 7-15.
The applicant finds, the number that increases the arm adopted has improved the thickening efficiency and the shear stability of polymkeric substance widely, has high relatively molecular weight (increase thickening efficiency) and do not need the gear oil VI improving agent of long arm (shear stability can be accepted) thereby can prepare.
Remain the star polymer of " activity ", after this can use currently known methods deactivation or " stopping active ", its method is to add the compound that reacts with the positively charged ion end group.The example of the deactivators that is fit to that can address is the compound that one or more reactive hydrogen atoms are arranged, as water, alcohol (methyl alcohol, ethanol, Virahol, 2-Ethylhexyl Alcohol) or carboxylic acid (for example acetate), compound (the compound that active chlorine atom is for example arranged that an active halogen atom is arranged, as zephiran chloride, methyl chloride) if, have the compound of an ester group and carbonic acid gas can not deactivate with this method, active star polymer can stop activity with step of hydrogenation (c).
Stopping before the activity, active star polymer can with the monomer reaction of other amount, diene identical as discussed above or inequality and/or mono-alkenyl aromatic substance type.The effect of the step of this increase except the number that increases polymer chain, has produced and has had more the active star polymer that has two dissimilar polymeric chains at least.For example, can be further and the isoprene monomer reaction derived from the active star polymer of active polyisoprene, produce the active star polymer that has more of polyisoprene chain that different weight-average molecular weight are arranged.In addition, active star polyisoprene homopolymer can react with styrene monomer, produces to have more active radial copolymer with polyisoprene and polystyrene homopolymer chain.Therefore as seen, different polymer chain meanings are the chain of different weight-average molecular weight and/or the chain of different structure.The weight-average molecular weight of additional arm must be in above-mentioned limited range.These further polymerizations can be carried out under the condition substantially the same with present method reactions steps (a).
In step (c), star polymer is with any suitable technology hydrogenant.What be fit to is to have at least 80%, and the former alkene degree of unsaturation of preferential selection at least 90%, override selection at least 95% is hydrogenated.If the star polymer part is derived from the mono alkenyl arene compound, the amount of hydrogenant aromatics degree of unsaturation (if existence) will depend on used hydrogenation conditions so.But, preferably be lower than 10%, be more preferably and be lower than 5% this aromatics degree of unsaturation and be hydrogenated.If poly-(polyalkenyl coupling agent) nuclear is one poly-(polyalkenyl aromatics coupling agent) nuclear, He aromatics degree of unsaturation may maybe can not be hydrogenated so, and this also is decided by used hydrogenation conditions.The weight-average molecular weight of hydrogenant star polymer is corresponding to the weight-average molecular weight of unhydrided star polymer.
The preferential hydride process of selecting is a U.S. Patent No. 3,595, the selective hydration method described in 942.The hydrogenation of this method is preferably carried out in the same solvent of preparation polymkeric substance, uses to comprise aluminum alkyls and nickel carboxylate or cobalt, or the catalyzer of the reaction product of alkanol nickel or cobalt.Good catalyzer is the reaction product that three second aluminium and nickel octoate form.
The hydrogenant star polymer reclaims in hydrogenation solvent with solid form, uses any technology easily, as evaporating solvent etc.In addition, oil (for example gear oil) can be added solution, desolventize from the mixture steaming that forms, to produce enriched material.Even surpass 10%(weight when the amount of wherein hydrogenant star polymer) time, also can obtain the easy to handle enriched material.The enriched material that is fit to contains 10-60%(weight) the hydrogenation star polymer, with the enriched material total weight.
Except the hydrogenant star polymer, the gear oil composition of shear stable of the present invention can comprise that one or more art technology experts know other additives of knowing, as antioxidant, and pour point reducer, dyestuff, sanitising agent etc.The gear oil additive that contains p and s is general additive commonly used.
Because shearing stress much strict than in the car engine in the application of gear oil, using the low-molecular weight polymer higher than high-molecular weight polymer shear stability is main for can look to resting on this multiviscosisty gear oil prescription after long-time the use.Can be in the prior art currently known methods of divergent function and/or clean function endowing viscosity index improver being incorporated into gear oil viscosity index improver of the present invention, such method comprises as U.S. Patent No. 4, disclosed metalation and the functionalization effect that contains the nitrogen of functional group in 145,298.
Gear oil composition of the present invention provides good shear stability.Provide than still less polymkeric substance in the prior art composition for the multiviscosisty gear oil composition.These compositions do not need pre-shearing, have reduced preparation cost.Polymkeric substance of the present invention also relatively can be dissolved in mineral oil, can prepare the viscosity modifier in the enriched material of higher concentration.Polymkeric substance of the present invention is particularly suitable for gear oil composition owing to require high shear stability.
The present invention also provides the method for preparing gear oil composition, and said composition is mixed mutually by the hydrogenation star polymer of base oil and 1-15 weight part (composition with 100 weight parts is a basic calculation) and formed; This hydropolymer comprises at least four arms, and (comprise the polymeric conjugated diene monomeric unit before hydrogenation, its weight-average molecular weight is 3, and 000-15 is in 000 the scope for each arm.
The present invention also provides and contains 0.1%(weight at least) use of the hydrogenation star polymer of (is basic calculation with the composition total weight): this polymkeric substance has four arms at least, every arm comprises that (before hydrogenation) polymeric conjugated diene monomeric unit, its weight-average molecular weight are 3,000-15, in 000 scope, as viscosity index improver, being added on the base oil is in the gear oil composition of major portion.
The present invention can be further understood from following example.
Example 1
Have weight-average molecular weight and be the preparation and the hydrogenation of the star polymer of 9,900,10,500,12,000,16,000,21,000 and 3,5000 polyisoprene arm, the hydrogenation of former olefinic degree of unsaturation is greater than 98%.These polymkeric substance are by difference called after star polymer 1-6.From following explanation as seen, star polymer 1-3 is applicable to gear oil composition of the present invention, and 4-6 is used for contrast.
These star polymers are done the preparation of initiator polymerization isoprene with s-butyl lithium in cyclohexane solution.Initiator is different with the ratio of isoprene, to obtain the weight-average molecular weight of specified arm.Active then arm is about 3 Vinylstyrene coupling with Vinylstyrene/lithium mol ratio.Hydrogenation is with nickel octoate (Ni(OCt) at 65 ℃
2) and the triethyl aluminum hydrogenation catalyst carry out.Use 1%(weight then) aqueous citric acid solution and water continue washing to extract hydrogenation catalyst.
Star polymer is dissolved in mineral oil, forms the enriched material of different weight polymers (solubleness that is decided by polymkeric substance).Used mineral oil is Shell HVI 250Neutral MQ, is a kind of bright limpid high viscosity index (HVI) base oil, and the viscosity in the time of 40 ℃ is 50.7-54mm
2/ s(ASTM D 445), viscosity is that index is 89-96(ASTM D 2270), minimum flash point is 221 ℃ (ASTM D 2270); Shell HVI 150 Bright Stock are bright limpid high viscosity index (HVI) base oil, and the viscosity in the time of 40 ℃ is 32-33.5mm
2/ s(ASTM D 445), viscosity index is 88-90(ASTM D 2270), minimum flash point is 293 ℃ (ASTM D 92):
The gear oil composition that has prepared the about 80W-140 level specification that comprises above-mentioned each star polymer and commodity engine oil viscosity index improving agent.Commodity engine oil viscosity index improving agent is a Shellvis 50(trade mark) (being that a kind of number-average molecular weight of measuring by polystyrene sheet silica gel permeation chromatography is linear hydrogenated styrene/isoprene copolymer of 135,000).Comprise pour point reducer Acryloid 154(trade mark or Hitec(trade mark in the gear oil composition).A kind of heavy-duty gear oil man product additive bag Anglamol 6020A(trade mark) is also included within the composition.Bu Luoke Field (Brookfield) viscosity when having listed the group component of each gear oil composition, the viscosity 100 ℃ time the and-26 ℃ in the table 1.The specification of 80W-140 machine oil is: the minimal viscosity in the time of 100 ℃ is 24mm
2/ s(e St) and the maximum Bu Luoke Field viscosity-26 ℃ the time be 150Pa S(1500P).Though not every mixture is all in this specification, all very near this specification, and the combination slight variations of available used lube stock is regulated.
Example 2
The shear stability of the star polymer described in the example 1 and prior art viscosity index improver are Autoresearch Laboratories, and Inc. measures with the gear lubricant shear stability test.This test preload gear unit that is similar to the hypoid differentiator, rotating speed is 3500rpm, lubricant temperature is 82 ℃.The oil capacity that needs is 1.419 liters (3 pints), gets 10 ml samples supervision viscosity change in certain time interval.
Shear stability index (SSI) be with the former viscosity of polymkeric substance and when shearing the percentage ratio of the viscosity of loss calculate.Table 2 has been summed up the result of shear stability test and the calculating of SSI.
Commodity engine oil viscosity index improving agent and arm weight-average molecular weight be 16,000 or the shear stability index of bigger star polymer be 44% or bigger.Because the variation that is produced on composition viscosity, these improving agents can not be accepted in gear oil.The hydrogenation star polymer of conjugated diolefine, the weight-average molecular weight of its polymeric arms is lower than 16,000 or lower, and shear stability index is 25% or littler, and this base polymer is receptible in gear oil.
Claims (10)
1, a kind of gear oil composition, said composition comprise base oil and hydrogenant star polymer, and this polymkeric substance has four arms at least, and every arm comprises (before hydrogenation) polymeric conjugated diene monomeric unit, and its weight-average molecular weight is in 3000 to 15000 scope.
2, the composition of claim 1, wherein conjugated diene monomeric unit is divinylic monomer, isoprene monomer or its mixture.
3, claim 1 or 2 composition, wherein the weight-average molecular weight of each arm is in 5,000 to 12,000 scope.
4, each composition of claim 1-3, wherein the shear stability index of hydrogenant star polymer is 25% or littler.
5, each composition in the aforementioned claim, wherein star polymer arm polyalkenyl coupling agent coupling.
6, the composition of claim 5, wherein the polyalkenyl coupling agent is a Vinylstyrene.
7, each composition in the aforementioned claim, said composition contains 0.1 to 20%(weight) the hydrogenation star polymer, based on the composition total weight.
8, the composition of claim 7, said composition contains 0.5-10%(weight) the hydrogenation star polymer, based on the composition total weight.
9, a kind of method for preparing each gear oil composition that is limited of claim 1 to 8, this method comprise mixes the hydrogenation star polymer of base oil with 1-15 weight part (composition based on 100 weight parts calculates) mutually.
10, use the weight of 0.1%(at least of total composition) the hydrogenation star polymer make an addition to as viscosity index improver and contain the gear oil composition of major portion as base oil; Said star polymer comprises at least four arms, and each arm comprises (before hydrogenation) polymeric conjugated diene monomeric unit, and its weight-average molecular weight is in 3,000 to 15,000 scope.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/590,417 US5070131A (en) | 1990-09-28 | 1990-09-28 | Gear oil viscosity index improvers |
| US590,417 | 1990-09-28 | ||
| US590417 | 1990-09-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1061793A true CN1061793A (en) | 1992-06-10 |
| CN1029562C CN1029562C (en) | 1995-08-23 |
Family
ID=24362187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN91109204A Expired - Fee Related CN1029562C (en) | 1990-09-28 | 1991-09-26 | Gear oil compositions |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5070131A (en) |
| EP (1) | EP0488432A1 (en) |
| JP (1) | JP3000567B2 (en) |
| KR (1) | KR100191968B1 (en) |
| CN (1) | CN1029562C (en) |
| AU (1) | AU641048B2 (en) |
| BR (1) | BR9104135A (en) |
| CA (1) | CA2052292C (en) |
| RU (1) | RU2041923C1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102453588A (en) * | 2010-10-25 | 2012-05-16 | 雅富顿公司 | Lubricant additive |
| CN102533397A (en) * | 2010-11-17 | 2012-07-04 | 通用汽车环球科技运作有限责任公司 | Gear assembly and gear oil composition |
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| EP0541180A3 (en) * | 1991-11-08 | 1993-11-18 | Shell Int Research | Star polymers, a process for their preparation and lubricating oil compositions and concentrates containing them |
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| EP2610332B1 (en) | 2011-12-30 | 2016-06-29 | The Lubrizol Corporation | Star polymer and lubricating composition thereof |
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- 1991-09-23 EP EP91202468A patent/EP0488432A1/en not_active Ceased
- 1991-09-25 KR KR1019910016676A patent/KR100191968B1/en not_active IP Right Cessation
- 1991-09-26 JP JP3247938A patent/JP3000567B2/en not_active Expired - Lifetime
- 1991-09-26 CN CN91109204A patent/CN1029562C/en not_active Expired - Fee Related
- 1991-09-26 BR BR919104135A patent/BR9104135A/en not_active IP Right Cessation
- 1991-09-26 RU SU915001730A patent/RU2041923C1/en active
- 1991-09-26 CA CA002052292A patent/CA2052292C/en not_active Expired - Fee Related
- 1991-09-26 AU AU84787/91A patent/AU641048B2/en not_active Ceased
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102453588A (en) * | 2010-10-25 | 2012-05-16 | 雅富顿公司 | Lubricant additive |
| CN102533397A (en) * | 2010-11-17 | 2012-07-04 | 通用汽车环球科技运作有限责任公司 | Gear assembly and gear oil composition |
| CN104710624A (en) * | 2013-12-12 | 2015-06-17 | 中国石油化工股份有限公司 | Hydrogenated star polymer, preparation method of hydrogenated star polymer, lubricating oil composition and lubricating oil master batch |
| CN104710624B (en) * | 2013-12-12 | 2017-06-30 | 中国石油化工股份有限公司 | Star-type polymer of hydrogenation and preparation method thereof and lubricant oil composite and lubricating oil masterbatch |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2052292C (en) | 2002-07-30 |
| CA2052292A1 (en) | 1992-03-29 |
| BR9104135A (en) | 1992-06-02 |
| KR100191968B1 (en) | 1999-06-15 |
| AU8478791A (en) | 1992-04-02 |
| JPH04283296A (en) | 1992-10-08 |
| AU641048B2 (en) | 1993-09-09 |
| EP0488432A1 (en) | 1992-06-03 |
| JP3000567B2 (en) | 2000-01-17 |
| KR920006490A (en) | 1992-04-27 |
| RU2041923C1 (en) | 1995-08-20 |
| US5070131A (en) | 1991-12-03 |
| CN1029562C (en) | 1995-08-23 |
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